How do I kill a backgrounded/detached ssh session?

Question

I am using the program synergy together with an ssh tunnel

It works, i just have to open an console an type these two commands:

ssh -f -N -L localhos         


        

Answer 1

You can use lsof to show the pid of the process listening to port 12345 on localhost:

lsof -t -i @localhost:12345 -sTCP:listen

Examples:

PID=$(lsof -t -i @localhost:12345 -sTCP:listen)
lsof -t -i @localhost:12345 -sTCP:listen >/dev/null && echo "Port in use"